Composite pane for a holographic head-up display

Abstract

A composite pane includes an outer pane having outer and inner surfaces, a first thermoplastic intermediate layer, a hologram element including a first set of holograms produced in one or more layers of a holographic material, wherein the first set of holograms includes a blue hologram that is activatable by blue light having a wavelength in a first range and is not responsive to light of other wavelengths, a green hologram that is activatable by green light having a wavelength in a second range and is not responsive to light of other wavelengths, and a red hologram that is activatable by red light having a wavelength in a third range and is not responsive to light of other wavelengths, an inner pane, and a color-selective optical filter for selective absorption of light.

The invention claimed is: 
     
         1 . A composite pane, comprising:
 an outer pane having an outer surface and an inner surface,   a first thermoplastic intermediate layer,   a hologram element comprising a first set of holograms produced in one or more layers of a holographic material, wherein the first set of holograms comprises a blue hologram that is activatable by blue light having a wavelength in a first range and is not responsive to light of other wavelengths, a green hologram that is activatable by green light having a wavelength in a second range and is not responsive to light of other wavelengths, and a red hologram that is activatable by red light having a wavelength in a third range and is not responsive to light of other wavelengths,   an inner pane having an outer surface and an inner surface, and   a color-selective optical filter for selective absorption of light having a wavelength in the first range, of light having a wavelength in the second range, and of light having a wavelength in the third range,   
       wherein the hologram element is arranged between the outer pane and the inner pane, the first thermoplastic layer is arranged between the outer pane and the hologram element or between the inner pane and the hologram element, and the entire color-selective optical filter is arranged in front of the hologram element when viewed in through-vision from the outside. 
     
     
         2 . The composite pane according to  claim 1 , wherein the color-selective optical filter comprises color pigments or nanoparticles for selective absorption of the blue light having a wavelength in the first range, of the green light having a wavelength in the second range, and of the red light having a wavelength in the third range. 
     
     
         3 . The composite pane according to  claim 1 , wherein the color-selective optical filter extends over at least 50% of an area of the composite pane. 
     
     
         4 . The composite pane according to  claim 3 , wherein the color-selective optical filter extends over at least 80% of the area of the composite pane. 
     
     
         5 . The composite pane according to  claim 4 , wherein the color-selective optical filter extends over at least 90% of the area of the composite pane. 
     
     
         6 . The composite pane according to  claim 1 , wherein the hologram element comprises a photopolymer, dichromate gelatin, or silver halides as a holographic material. 
     
     
         7 . The composite pane according to  claim 6 , wherein the hologram element comprises dichromate gelatin or silver halides as a holographic material and is implemented as a coating of the outer surface of the inner pane ( 2 ), and wherein the first thermoplastic intermediate layer is arranged between the outer pane and the hologram element. 
     
     
         8 . The composite pane according to  claim 6 , additionally comprising a second thermoplastic intermediate layer arranged between the outer pane and the inner pane, wherein the hologram element is arranged between the first thermoplastic intermediate layer and the second thermoplastic intermediate layer, wherein the hologram element comprises holographic material in the form of dichromate gelatin or silver halides and a first substrate layer, and wherein the hologram element is arranged in the composite pane such that the holographic material faces in a direction of the outer pane and the first substrate layer faces in a direction of the inner pane. 
     
     
         9 . The composite pane according to  claim 6 , wherein the first thermoplastic intermediate layer is arranged between the inner pane and the hologram element, wherein the hologram element comprises holographic material in the form of dichromate gelatin or silver halides and a first substrate layer, wherein the holographic material is applied as a coating on the inner surface of the outer pane, and wherein the first substrate layer is arranged between the holographic material and the first thermoplastic intermediate layer. 
     
     
         10 . The composite pane according to  claim 6 , wherein the first thermoplastic intermediate layer is arranged between the outer pane and the hologram element, wherein the hologram element comprises holographic material in the form of a photopolymer and a second substrate layer, wherein the second substrate layer is arranged between the first thermoplastic intermediate layer and the holographic material, and wherein the holographic material is bonded to the outer surface of the inner pane by means of an optical clear adhesive. 
     
     
         11 . The composite pane according to  claim 1 , additionally comprising a second thermoplastic intermediate layer arranged between the outer pane and the inner pane, wherein the first thermoplastic intermediate layer is arranged between the outer pane and the hologram element, the second thermoplastic intermediate layer is arranged between the inner pane and the hologram element, wherein the hologram element is arranged between the first thermoplastic intermediate layer and the second thermoplastic intermediate layer, wherein the hologram element comprises the holographic material and a second substrate layer arranged adjacent the first thermoplastic intermediate layer and a first substrate layer arranged adjacent the second thermoplastic intermediate layer, and wherein the holographic material is arranged between the first substrate layer and the second substrate layer. 
     
     
         12 . The composite pane according to  claim 11 , wherein the color-selective optical filter is implemented as a coating on the second substrate layer or as color pigments or nanoparticles that are embedded in the second substrate layer. 
     
     
         13 . The composite pane according to  claim 1 , wherein the color-selective optical filter is implemented as a coating on the outer surface or the inner surface of the outer pane or as a coating on one of the layers arranged between the outer pane and the hologram element or as color pigments or nanoparticles that are embedded in the outer pane or in one of the layers arranged between the outer pane and the hologram element. 
     
     
         14 . The composite pane according to  claim 1 , wherein the hologram element additionally comprises a second set of holograms produced in one or more layers of the holographic material, and the second set of holograms comprises a blue hologram that is activatable by blue light having a wavelength in the first range and is not responsive to light of other wavelengths, a green hologram that is activatable by green light having a wavelength in the second range and is not responsive to light of other wavelengths, and a red hologram that is activatable by red light having a wavelength in the third range and is not responsive to light of other wavelengths. 
     
     
         15 . The composite pane according to  claim 1 , wherein the first range, the second range, and the third range are in each case, independently of one another, at most 17 nm wide. 
     
     
         16 . The composite pane according to  claim 15 , wherein the first range, the second range, and the third range are in each case, independently of one another, at most 3 nm wide. 
     
     
         17 . A method for producing a composite pane according to  claim 1 , comprising:
 a) providing an outer pane having an outer surface and an inner surface, a first thermoplastic intermediate layer, an inner pane having an outer surface and an inner surface, and a color-selective optical filter for absorption of light having a wavelength in the first range, of light having a wavelength in the second range, and of light having a wavelength in the third range,   b) providing a hologram element by producing, in one or more layers of a holographic material, a first set of holograms, wherein the first set of holograms comprises a blue hologram that is activatable by blue light having a wavelength in a first range and is not responsive to light of other wavelengths, a green hologram that is activatable by green light having a wavelength in a second range and is not responsive to light of other wavelengths, and a red hologram that is activatable by red light having a wavelength in a third range and is not responsive to light of other wavelengths,   c) forming a layer stack, in which the hologram element is arranged between the outer pane and the inner pane, the first thermoplastic layer is arranged between the outer pane and the hologram element or between the inner pane and the hologram element, and the color-selective optical filter is arranged in front of the hologram element when viewed in through-vision from the outside, and   d) joining the layer stack by lamination.   
     
     
         18 . A method comprising providing a composite pane according to  claim 1  as interior glazing or exterior glazing in a vehicle or a building. 
     
     
         19 . The method according to  claim 18 , wherein the composite pane is a vehicle pane in a vehicle of locomotion for travel on land, in the air, or on water. 
     
     
         20 . The method according to  claim 19 , wherein the vehicle pane is a windshield that serves as a projection surface.